Dynamic anti-seepage detection system for in-situ leaching uranium mine evaporation pond and construction method

Abstract

The invention belongs to a detection system and method, and particularly relates to a dynamic anti-seepage detection system for an in-situ leaching uranium mine evaporation pond and a construction method. The in-situ leaching uranium mine evaporation pond dynamic anti-seepage detection system comprises an evaporation pond, and a detection optical cable is arranged below the evaporation pond. The method has the remarkable effects that the heating and temperature sensing optical cables are laid below the evaporation pond according to fixed intervals, when a leakage accident occurs, the temperature of a leakage point can change obviously, the leakage point can be found out in time, the solution state of the evaporation pond can be mastered accurately in real time, and leakage information can be early warned in time through the laying path of the temperature sensing optical cables; and the absolute safety of the radioactive water body in the evaporation pond is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of detection systems and methods, and particularly relates to a dynamic anti-seepage detection system and construction method for an evaporation pond in an in-situ leaching uranium mine. Background Art

[0002] During the production operation of a CO2+O2 in-situ leaching uranium mine, in order to control the range of groundwater leaching, in accordance with the "Regulations on Radiation Protection and Radiation Environmental Protection for Uranium Mining and Metallurgy" GB23727-2020, 0.3%-0.5% of the leaching agent and low-radioactive water bodies such as the process wastewater of the uranium hydrometallurgy plant need to construct a surface evaporation facility - an evaporation pond that matches the production scale of the mining enterprise. Relying on natural evaporation methods such as solar energy for evaporation treatment to achieve the safe and environmental protection goal of "zero" external discharge, and the national ecological environment supervision and inspection department also lists the evaporation pond as one of the key inspection contents. To further ensure the environmental protection disposal of the above-mentioned low-radioactive water bodies, it is necessary to construct monitoring wells around the evaporation pond to regularly detect the underground water body below the evaporation pond to ensure that the underground water body is not polluted. As a radioactive wastewater disposal detection method, this method is widely used in in-situ leaching uranium mining enterprises. However, this method can only control the pollution range and cannot give an early warning of the leakage of the evaporation pond in a timely and accurate manner. With the development of the national natural uranium industry and the upgrading of safety and environmental protection requirements, it is necessary to develop a method that can detect the leakage of the evaporation pond in a timely manner, discover and dispose of it in a timely manner, and ensure the long-term stable operation of the evaporation pond to meet the safety and environmental protection requirements of the national ecological environment supervision and inspection department for in-situ leaching mines. Summary of the Invention

[0003] Aiming at the defects of the existing technology, the present invention provides a dynamic anti-seepage detection system and construction method for an evaporation pond in an in-situ leaching uranium mine.

[0004] The present invention is realized as follows: A dynamic anti-seepage detection system and construction method for an evaporation pond in an in-situ leaching uranium mine, which includes an evaporation pond, and a detection optical cable is arranged below the evaporation pond.

[0005] For a dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine as described above, the detection optical cable is arranged in a serpentine shape, and the arrangement area covers the entire evaporation pond.

[0006] For a dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine as described above, the detection optical cable includes a temperature-sensitive optical cable and a heating optical cable. The heating optical cable is arranged below the bottom of the evaporation pond, and the temperature-sensitive optical cable is arranged below the heating optical cable.

[0007] For a dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine as described above, the heating optical cable is 5 cm away from the bottom of the evaporation pond.

[0008] A dynamic anti-seepage detection system for an in-situ leaching uranium mine evaporation pond as described above, wherein the temperature-sensitive optical cable is 0.1 - 0.25 m away from the heating optical cable, and a V-shaped groove is provided at this position. The V-shaped groove is used to accommodate the temperature-sensitive optical cable, the width of the V-shaped groove is 0.3 - 0.4 m, and the spacing of the V-shaped grooves is 2 - 4 m

[0009] A dynamic anti-seepage detection system for an in-situ leaching uranium mine evaporation pond as described above, wherein the V-shaped groove is filled with medium-coarse sand, and the thickness of the filled coarse sand is 5 cm.

[0010] A dynamic anti-seepage detection system for an in-situ leaching uranium mine evaporation pond as described above, wherein the diameter of the sand body of the coarse sand filled in the V-shaped groove is 0.25 - 0.5 mm.

[0011] A construction method for a dynamic anti-seepage detection system of an in-situ leaching uranium mine evaporation pond, which includes the following steps:

[0012] Step 1: Installation of temperature-sensitive optical cable

[0013] The temperature-sensitive optical cable is installed 0.1 - 0.25 m below the heating optical cable. A V-shaped groove with a depth of excavation of 0.1 - 0.25 m, a width of 0.3 - 0.4 m, and a spacing of 2 - 4 m is dug; 5 cm of medium-coarse sand with a sand body diameter of 0.25 - 0.5 mm is filled in the dug groove, the optical cable is laid in the V-shaped groove, and fine sand is laid above to the opening of the V-shaped groove;

[0014] Step 2: Installation of heating optical cable

[0015] The heating optical cable is laid above the temperature-sensitive optical cable according to the same layout. After the optical cable laying is completed, the bottom of the evaporation pond is filled with 5 cm of fine sand as a whole to ensure uniform heating of the bottom of the pond and relatively stable temperature;

[0016] Step 3: Commissioning of surface terminal

[0017] The surface uses a distributed temperature system - linear optical cable temperature-sensitive fire detector as the terminal for commissioning,

[0018] When the monitoring system is set with parameters for the first time, it needs to be preheated for more than 30 minutes to stabilize the system's temperature measurement. After that, the leakage monitoring software will automatically collect the temperature data of the temperature-sensitive optical cable in Channel 1 for more than 60 minutes. Then, the system will automatically switch to supply power to the heating wire of the heating optical cable in Channel 2. Here, the current is gradually increased to the required value by continuously applying current, and the power supply is maintained for 60 - 80 minutes, depending on the actual achievement of thermal equilibrium. It is necessary to ensure that the temperature of the optical cable does not exceed the working limit temperature of the optical cable, which is 70 degrees, during the heating process to ensure the safety of the optical cable. After the optical cable reaches thermal equilibrium, the system collects the optical cable data for 60 minutes. Then, the power supply current is reduced to zero in a step-by-step manner, and the power supply is turned off to collect data. After the data collection is completed, the system software compares the temperature data of the optical cable collected three times. The system software will judge whether there are suspicious seepage points on the dam based on the obtained difference values, and give analysis data and results.

[0019] The remarkable effect of the present invention is that heating and temperature-sensitive optical cables are laid at fixed intervals below the evaporation pond. When a leakage accident occurs, the temperature at the leakage point will change significantly. Through the laying path of the temperature-sensitive optical cable, the leakage point can be found in time, the state of the evaporation pond solution can be grasped in real time and accurately, early warnings for leakage information can be given in time, and the leakage can be discovered and handled in time to ensure the absolute safety of the radioactive water body in the evaporation pond. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the installation of the heating optical cable

[0021] Figure 2 Plan view of the installation of the heating optical cable and the temperature-sensitive optical cable

[0022] Figure 3 Sectional view of the installation of the temperature-sensitive optical cable

[0023] In the figure: 1. Pond embankment, 2. Geomembrane, 3. Detection optical cable, 4. Evaporation pond, 5. Surface terminal, 6. Bottom of the evaporation pond, 7. V-shaped groove DETAILED DESCRIPTION OF THE INVENTION

[0024] A dynamic anti-seepage detection system and construction method for an in-situ leaching uranium mine evaporation pond include the following contents:

[0025] (1) Installation of the temperature-sensitive optical cable

[0026] The temperature-sensitive optical cable is installed at a position 0.1 - 0.25 m below 3. A V-shaped groove with a depth of 0.1 - 0.25 m and a width of 0.3 - 0.4 m is excavated, and the spacing is 2 - 4 m (which can be adjusted according to the spacing of the geomembrane, with a maximum not exceeding 4 m). 5 cm of medium-coarse sand with a sand body diameter of 0.25 - 0.5 mm (pay attention to removing stones with a diameter greater than 6 mm) is filled in 7. The optical cable is laid in 7, and fine sand is laid above it to the opening of the V-shaped groove.

[0027] (2) Installation of Heating Optical Cable

[0028] Lay the heating optical cable above the temperature-sensing optical cable according to the same layout. After the optical cable laying is completed, the bottom of the evaporation pond is filled with 5 cm of fine sand as a whole to ensure uniform heating of the pond bottom and relatively stable temperature.

[0029] (3) Commissioning of Surface Terminal

[0030] The surface uses a distributed temperature system (DTS) - the linear optical cable temperature-sensing fire detector is 5, which is composed of a temperature measurement host, application software, sensing optical cable and other peripheral equipment configurations, and has many advantages such as anti-radio frequency, electromagnetic interference, fire prevention, explosion prevention, high temperature resistance, and long service life.

[0031] 5 When setting parameters for the first time, it is necessary to preheat for more than 30 minutes to ensure stable temperature measurement of the system (this step can be ignored for the long-term operation of the optical fiber temperature measurement host). After that, the leakage monitoring software will automatically collect the temperature data of the temperature-sensing optical cable in Channel 1, and it is necessary to collect for more than 60 minutes (the specific time is determined according to the requirements for temperature accuracy. At this time, record the lowest temperature value, and the user needs to set multiple groups of parameters for switching according to the local climate conditions). Then the system automatically switches to supply power to the heating wire of the heating optical cable in Channel 2. Here, the current is gradually increased to the required value by continuously applying current, and the power supply is continued for 60 - 80 minutes (the specific time is determined according to the actual achievement of thermal equilibrium, and it is necessary to ensure that the temperature of the optical cable does not exceed the working limit temperature of the optical cable, which is 70 degrees, to ensure the safety of the optical cable); after the optical cable reaches thermal equilibrium, the system collects the optical cable data for 60 minutes (the specific time is determined according to the requirements for temperature accuracy), then the power supply current is reduced to zero by gradually reducing the current, and then the power supply is turned off to collect data. After the data collection is completed, the system software compares the difference of the optical cable temperature data collected three times. The system software will judge whether there are suspicious points of seepage in the dam according to the obtained difference, and give the analysis data and results.

[0032] During the actual operation process, the system will conduct real-time monitoring according to the measured early warning parameter thresholds. Once there is a temperature difference at the leakage point caused by leakage, the system will automatically alarm.

Claims

1. A dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine, characterized in that: It includes an evaporation pond surrounded by a pond dike, and a detection optical cable is arranged below the evaporation pond.

2. The dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine according to claim 1, characterized in that: The detection optical cable is arranged in a serpentine shape, and the arrangement area covers the entire evaporation pond.

3. The dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine according to claim 2, characterized in that: The detection optical cable includes a temperature-sensitive optical cable and a heating optical cable. The heating optical cable is arranged below the bottom of the evaporation pond, and the temperature-sensitive optical cable is arranged below the heating optical cable.

4. The dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine according to claim 3, characterized in that: The heating optical cable is 5 cm away from the bottom of the evaporation pond.

5. The dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine according to claim 4, characterized in that: The temperature-sensitive optical cable is 0.1 - 0.25 m away from the heating optical cable. A V-shaped groove is arranged at this position. The V-shaped groove is used to accommodate the temperature-sensitive optical cable. The width of the V-shaped groove is 0.3 - 0.4 m, and the spacing of the V-shaped grooves is 2 - 4 m.

6. The dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine according to claim 5, characterized in that: The V-shaped groove is filled with medium-coarse sand, and the thickness of the filled coarse sand is 5 cm.

7. The dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine according to claim 6, characterized in that: The diameter of the sand body of the coarse sand filled in the V-shaped groove is 0.25 - 0.5 mm.

8. A construction method for a dynamic anti-seepage detection system for an evaporation pond in an in-situ leaching uranium mine, characterized in that, It includes the following steps: Step 1: Installation of the temperature-sensitive optical cable The temperature-sensitive optical cable is installed 0.1 - 0.25 m below the heating optical cable. A V-shaped groove with a depth of 0.1 - 0.25 m and a width of 0.3 - 0.4 m is excavated, with a spacing of 2 - 4 m; 5 cm of medium-coarse sand with a sand body diameter of 0.25 - 0.5 mm is filled in the excavated groove, and the optical cable is laid in the V-shaped groove, and fine sand is laid above it to the V-shaped groove opening; Step 2: Installation of the heating optical cable The heating optical cable is laid above the temperature-sensitive optical cable according to the same layout. After the optical cable laying is completed, the bottom of the evaporation pond is filled with 5 cm of fine sand as a whole to ensure uniform heating of the pond bottom and relatively stable temperature; Step 3: Commissioning of the surface terminal The surface uses a distributed temperature system - linear optical cable temperature-sensitive fire detector as the terminal for commissioning. When the monitoring system sets parameters for the first time, it needs to be preheated for more than 30 minutes to make the system temperature measurement stable. Then the leakage monitoring software will automatically collect the temperature data of the temperature-sensitive optical cable in Channel 1, and it needs to be collected for more than 60 minutes; then the system automatically switches to the heating wire power supply of the heating optical cable in Channel 2. Here, the current is gradually increased to the required value by continuously applying current, and the power supply is continued for 60 - 80 minutes, depending on the actual achievement of thermal equilibrium. It is necessary to ensure that the temperature of the optical cable does not exceed the working limit temperature of the optical cable, which is 70 degrees, during the heating process to ensure the safety of the optical cable; after the optical cable reaches thermal equilibrium, the system collects the optical cable data for 60 minutes, then the power supply current is reduced to zero by gradually reducing the current, and then the power supply is turned off and the data is collected. After the data collection is completed, the system software compares the differences in the optical cable temperature data collected three times. The system software will judge whether there are suspicious points of seepage in the dam according to the obtained differences, and give analysis data and results.

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